CVE-2026-29004
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
BusyBox before commit 42202bf has a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler. A network-adjacent attacker can send a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option to trigger memory corruption.
Risk Assessment
This vulnerability allows an attacker to cause denial of service or potentially achieve arbitrary code execution on embedded systems without heap hardening, compromising device integrity and availability.
Recommendation
Update BusyBox to a version containing commit 42202bf or later. If updating is not possible, disable the DHCPv6 client (udhcpc6) or apply additional network security measures.
Other vulnerabilities in BusyBox
See all- CVE-2017-16544High
In the add_match function in libbb/lineedit.c in BusyBox through 1.27.2, the tab autocomplete feature does not sanitize filenames, potentially leading to executing any escape sequences in the terminal.
- CVE-2011-5325High
Directory traversal vulnerability in the BusyBox implementation of tar before version 1.22.0 v5 allows remote attackers to point to files outside the current working directory via a symlink.
- CVE-2016-2147High
Integer overflow in the DHCP client (udhcpc) in BusyBox before version 1.25.0 allows remote attackers to cause a denial of service (crash) via a malformed RFC1035-encoded domain name, leading to an out-of-bounds heap write.
- CVE-2016-6301High
The recv_and_process_client_pkt function in networking/ntpd.c in busybox allows remote attackers to cause a denial of service via a forged NTP packet, triggering a communication loop.
- CVE-2022-48174Critical
A stack overflow vulnerability exists in ash.c:6030 in busybox before version 1.35. In the Internet of Vehicles environment, it can be exploited from command execution to arbitrary code execution.
- CVE-2026-76014Low
A vulnerability was found in BusyBox up to version 1.30.1 in the file networking/wget.c, in the FEATURE_WGET_TIMEOUT Handler component. Manipulation of the -T argument leads to a null pointer dereference. Local access is required. The exploit has been disclosed, and a patch is available (commit 83a40bf7a93c8ac093d33ab452222dd5b9eb57ff).
- CVE-2026-38755Low
A heap overflow in the evalcommand() function (shell/ash.c) of BusyBox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.
- CVE-2026-38754Medium
Heap overflow in the ifsbreakup() function (shell/ash.c) of Busybox v1.38.0. An attacker can cause a Denial of Service (DoS) by supplying crafted input.
- CVE-2026-38752Low
A stack overflow vulnerability exists in the evaluate() function (editors/awk.c) of BusyBox commit 371fe9. Attackers can cause a Denial of Service (DoS) by supplying a crafted AWK script.
- CVE-2026-38753Medium
A use-after-free vulnerability in the awk_sub() function (editors/awk.c) of BusyBox v1.38.0 allows attackers to cause a Denial of Service (DoS) by supplying a crafted AWK script.
Original NVD description (English source)
BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.